Optimal setup when mixing different RAM's?

[Supergun1]

Hey! I recently got a little faster RAM from my previous one. It's Crucial Crucial Ballistix RGB 16GB Kit (2 x 8GB) DDR4-3200 (BL2K8G32C16U4BL).

My old RAM was G.Skill Ripjaws V DDR4-2666 CL15 Quad kit 16GB (4x4GB).

MOBO: Asus X99-A/USB3.1
CPU: I7-6800k

Now, I got the new RAM as a gift so it wasn't my choice and I would have opted for more of the same RAM if I had the choice. Now, I have a quad channel mobo and a CPU that supports it.
What would be the optimal setup, as to what slots to put what sticks in, if I were to mix them together. I know there might be problems etc, but I do need the extra RAM, rather than the "3200mhz" speed.
Because of the quad channel, how do I manage it? Do I put respective sticks to their own channel and then have the 2x4GB leftover in leftover slots? Or do I just mix the 8GB and the 4GB into quad channels?

[porina]

I have no proof of the effectiveness but logically to me it seems an idea to try and balance the capacity per channel. I don't think it matters much which channel gets which. So look up your mobo manual to find out which channel goes to which slots. In two of the channels, put the new 8 GB modules. In the other two channels, put 2x4GB. Hopefully this will balance the load to the different channels and have a smaller impact to performance than unbalanced strategies.

[Supergun1]

5 minutes ago, porina said:

I have no proof of the effectiveness but logically to me it seems an idea to try and balance the capacity per channel. I don't think it matters much which channel gets which. So look up your mobo manual to find out which channel goes to which slots. In two of the channels, put the new 8 GB modules. In the other two channels, put 2x4GB. Hopefully this will balance the load to the different channels and have a smaller impact to performance than unbalanced strategies.

So should I just leave the leftover 2x4GB out of the system completely, for compatability? Or just put them into the next, single channel slots?

[porina]

1 hour ago, Supergun1 said:

So should I just leave the leftover 2x4GB out of the system completely, for compatability? Or just put them into the next, single channel slots?

It looks like your mobo has 8 ram slots right? You need to look in the manual to work out which is which, but I would put them in something like following:

Channel 1: 8GB + empty

Channel 2: 8GB + empty

Channel 3: 4GB + 4GB

Channel 4: 4GB + 4GB

 

That way each channel has 8GB total and they should fill equally and you retain the benefit of quad channel regardless of how much ram you use.

 

[Supergun1]

3 hours ago, porina said:

It looks like your mobo has 8 ram slots right? You need to look in the manual to work out which is which, but I would put them in something like following:

Channel 1: 8GB + empty

Channel 2: 8GB + empty

Channel 3: 4GB + 4GB

Channel 4: 4GB + 4GB

 

That way each channel has 8GB total and they should fill equally and you retain the benefit of quad channel regardless of how much ram you use.

 

Hey! Yep, it's exactly like that, worked just fine and I have 32GB in total. I doesn't feel unstable or any slower at all, as I've kinda been afraid mixing these RAM would do. Thanks a lot for the help!